Content Comparison

class MainViewController: UiViewControlelr {
      var interstitialId:Int32 = -1;
      ...
      override func viewDidLoad() {
        super.viewDidLoad()
        ...
          interstitialId = RefineryAdFactory.shared.createInterstitial(...)
        ...
          // Set up an action on uiButton to display loaded interstitial with it's interstitialId. 
          uiButton.addAction(UIAction(handler: {_ in
            RefineryAdFactory.shared.show(index: interstitialId)
          }), for: .touchUpInside)
        }
      ...
    }